Mechanical impact tool



March 10, 1953 A. F. MYERS 2,530,852

MECHANICAL IMPACT TOOL Filed June 2', 1950 2 SHEETS-SHEET l INVENTORALLEN Fl MYERS March 10, 1953 A. F. MYERS 2,630,852

MECHANICAL IMPACT TOOL Filed June 2,. 1950 2 SHEETSSHEET 2 w 48 FIG 5 4622 FIG, 6. 26 34 I0 24 30 [W '28 3o 36 56 I I 54 INVENTOR ALLEN F. MYERSPatented Mar. 10, 1953 MECHANICAL IMPACT TOOL Allen F. Myers, KansasCity, Mo., assignor to John A. Stovall, Mountain Home, Ark.

Application June 2, 1950, Serial No. 165,771

Claims.

This invention relates generally to improvements in power-drivenimpacting tools and, more particularly, to tools designed for use instraightening and smoothing sheet metal, and for various other purposes.

The primary object of the instant invention is to provide a power-driventool, which is compact and easily handled without placing any strain onan operator or requiring any manual power.

Another object of this invention is to provide a power-driven impacttool, which is extremely light and portable in nature and which isequipped with means for eliminating undue strain upon the parts of thetool and upon the operator.

Another object of this invention is the provision of a tool of thistype, wherein the heads are readily interchangeable.

These and ancillary objects and structural features of merit areattained by this invention, the preferred embodiment of which is setforth in the following description and illustrated in the accompanyingdrawings, wherein:

Figure 1 is a view in perspective of a tool, constructed in accordancewith this invention, and illustrating the same in an operationalenvironment;

Figure 2 is a side elevational view of the tool;

Figure 3 is a side elevational view thereof with the protective hood orcover removed;

Figure 4 is a transverse, sectional view taken on line 4-4 of Figure 3.

Figure 5 is a transverse, sectional view taken on line 55 of Figure 3;and

Figure 6 is a longitudinal, sectional view taken on line 66 of Figure 5.

Referring now more particularly to the drawings, the tool Ii! includes arotary power shaft I 2, which is rotatably housed in a tubular housing[4. The power shaft I2 is connected by a flexible cable or connection Itwith an electric motor or suitable prime mover la, the motor beingmounted on a Wheel-mounted base 28. The motor I8 may be positioned atany point remote from the tool, and power is transmitted to the driveshaft I2 through the flexible connection 16.

An eccentric 22 is fixed on the projecting end 24 of the drive shaft 12and is provided with an integral balanced weight 26. A pin 28 extendslaterally from the eccentric, and the upper sleeve end 30 of aconnecting crank link 32 is mounted on the projecting portion of the pinand held thereon by a cotter pin 34. The sleeve 39 is disposed on abushing 36, as seen in Figure 6.

Guide means 38 is provided for the removable heads carried by theconnecting crank link 32. The guide means 38 includes a sleeve 49 withinwhich a bushing 22 is positioned. An apertured flange 44 projectslaterally from the upper end of the sleeve 40, and a fastener 46 iscarried thereby. The fastener is secured to the lateral extension 48 ofa collar 50, which is concentrically clamped on the housing [4.

The head or striker member 52 is bifurcated at its upper end and isformed with branches 5!; and 56. The lower apertured end of the link 32'is disposed between the branches, and the branches are suitablyapertured to receive a floating wrist pin 58, which is mounted in thelower end of the link.

The upper end of the sleeve is formed on its inner surface with upwardlyand outwardly slanting diametrically opposed slots and 62, whereby, asseen in Figure 5, the link 32 can freely move upwardly and downwardly inthe sleeve to reciprocate the striker member 52 in response to therotation of the eccentric 22 on the rotary drive shaft l2.

A compensating spring 64 is coiled on the sleeve 40 and abuts againstthe shoulder 66 formed on the upper end thereof, the spring extendingbeyond the lower end of the sleeve and being concentric with the strikermember 52. The spring 64 functions as a shock absorber to compensate forthe impact of the head or striker member 52 against the work piece andalso assists in the straightening of the work when pressed against thework.

A concavo-convex hood or shield 66 is formed with arcuate flanges 68 and10, the flange 68 being fitted on the upper end of the sleeve 40 andfastened thereto by a screw 12, and the flange 16 being mounted on theclamping collar 50 and fastened thereto by a screw 14.

In use, the tool can be held in one hand by an operator, the operatorgrasping the housing l4, and the other hand of the operator can bepositioned on the head 66 to hold the impacting end of the tool inengagement with the work, such as the side of a vehicle 16. As the shaft12 is driven through the motor I8, the eccentric is rotated toreciprocate the link 32, and the striking member 52 carried thereby.

Of course, various heads may be employed, such as peens, hammers, sawsor the like. To effect a substitution of the heads, it is only necessaryto remove the fastener 46 from the extension 43 of the collar 50,whereby the guide sleeve 40 may be removed and the pin 58, which isloosely mounted, can be withdrawn. Various 3 types of hammers can thenbe substituted for the striking member 52 without the necessity ofremoving the cotter pin 34 or disturbing the connecting link 32. Thus,the heads or striker members 52 are readily and easily interchangeable.

Having thus described the invention, what is claimed is:

1. A power-driven impact tool comprising a sleeve like housing, a rotarydrive shaft in said housing and having one end projecting from thehousing, an eccentric disposed on said end of the shaft, a balancedweight associated with said eccentric, a link pivoted at one end to theeccentric, a guide sleeve detachably carried by the housing and disposedat right angles thereto, said 1ink being disposed within the sleeve, ahead carried by the other end of the link and slidably housed in thesleeve for reciprocating movement from one end thereof, means releasablyconnecting said head to the link said means being retained in positionby the sleeve, and a spring coiled around said sleeve and projectingbeyond the end of the sleeve from which the head operatively projects,said spring being adapted to bear against a work piece, and aconcave-convex shield surrounding said end of the shaft and eccentric,said shield being secured to the housing and the sleeve.

2. The combination of claim 1, wherein said sleeve is formed withdiametrically opposed vertical slots in its upper end forming guides forthe link in its reciprocating movement in the sleeve.

3. The combination of claim 1, wherein said connecting means includes afloating wrist pin transversely inserted through the adjoining ends ofthe link and head, said head being bifurcated and said link end beingpivoted on the pin between the bifurcations.

4. The combination of claim 1, wherein said sleeve is formed with alateral flange and a clamp is mounted on the housing and ailxed to theflange for supporting the sleeve.

5. The combination of claim 1, wherein said sleeve is formed with anannular shoulder seating the inner end of the spring.

ALLEN F. MYERS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,809,340 Hilstad June 9, 19311,846,905 Pesola Feb. 23, 1932

